Expand name before looking for window with -S, GitHub issue 3670.

Replace %% in command lists (by copying them) for template arguments ,
this means they can be used with {} as well. Also make argument
processing from an existing vector preserve commands. GitHub iss

Replace %% in command lists (by copying them) for template arguments ,
this means they can be used with {} as well. Also make argument
processing from an existing vector preserve commands. GitHub issue 2858.

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Rename a member to match what it will be in future.

Add args parsing callback for some future work, currently unused.

Hide struct args behind a couple of accessor functions.

Remove some unnecessary blank lines.

Expose args_value struct (will be needed soon) and add some missing frees.

Add a -S flag to new-window to make it select the existing window if one
with the given name already exists rather than failing with an error.
Also add a format to check if a window or session name e

Add a -S flag to new-window to make it select the existing window if one
with the given name already exists rather than failing with an error.
Also add a format to check if a window or session name exists which
allows the same with other commands. Requested by and discussed with
kn@.

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Silently ignore -a or -b if the window index doesn't exist and create
using that index (this is how it used to work), reported by Romain
Francoise.

Add -b flags to insert a window before (like the existing -a for after)
to break-pane, move-window, new-window. GitHub issue 2261.

Make client -c and -t handling common in cmd-queue.c and try to be
clearer about whether the client is the target client (must have a
session) or not.

Move cmdq_state into cmd-queue.c.

Rename cmdq_shared to cmdq_state which will better reflect what it is
(going to be) used for.

Also move cmdq_item and cmdq_list into cmd-queue.c (this is to make its
use more clearly defined and preparation for some future work).

Make struct cmd local to cmd.c and move it out of tmux.h.

Use new window and new pane as well for -P to new-session or new-window.

Add a way to mark environment variables as "hidden" so they can be used
by tmux but are not passed into the environment of new panes.

Add a "latest" window-size option which tries to size windows based on
the most recently used client. From Tommie Gannert in GitHub issue 1869
based on earlier changes from me.

Support multiple occurances of the same argument. Use this for a new
flag -e to new-window, split-window, respawn-window, respawn-pane to
pass environment variables into the newly created process. Fr

Support multiple occurances of the same argument. Use this for a new
flag -e to new-window, split-window, respawn-window, respawn-pane to
pass environment variables into the newly created process. From Steffen
Christgau in GitHub issue 1697.

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Merge hooks into options and make each one an array option. This allows
multiple commands to be easily bound to one hook. set-hook and
show-hooks remain but they are now variants of set-option and
sh

Merge hooks into options and make each one an array option. This allows
multiple commands to be easily bound to one hook. set-hook and
show-hooks remain but they are now variants of set-option and
show-options. show-options now has a -H flag to show hooks (by default
they are not shown).

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Break new window and pane creation common code from various commands and
window.c into a separate file spawn.c.

Fix new-window -k, GitHub issue 1403.

Make server_client_get_cwd used (almost) everywhere we need to work out
the cwd, and do not fall back to "." as it is pretty useless. GitHub
issue 1331.

Use window target if specified and exists even when looking for an
index, fixes neww -a with -t as well.

Expand formats in window and session names.